public ActionResult _Update(Customer customer)
        {
            var northwind = new NorthwindDataContext();
            
            var target = northwind.Customers.FirstOrDefault(c => c.CustomerID == customer.CustomerID);

            if (target != null)
            {
                target.CompanyName = customer.CompanyName;
                target.ContactName = customer.ContactName;
                northwind.SubmitChanges();
            }

            return View(new GridModel(GetCustomers()));
        }
 partial void DeleteCustomer(Customer instance);
 partial void UpdateCustomer(Customer instance);
 partial void InsertCustomer(Customer instance);